Probabilistic Seismic Assessment of Steel Frames under Consecutive Earthquakes: A Comparison between Moment Frames and Linked-Column Frames

Document Type : Research Article

Authors

1 School of Civil Engineering, Iran University of Science and Technology

2 Postdoctoral Fellow, Iran University of Science and Technology

Abstract

Recent studies show that aftershocks can intensify structural damage and even lead to the collapse of the structures. Among the structural systems, moment frames show desirable ductility, but in such systems damage spreads in many structural elements. Accordingly, it is possible for these systems to experience more severe damage during an earthquake. Recently, Linked-Column Frame (LCF) is introduced to limit structural damage in moment frames, which can prevent the formation of plastic hinges in major structural members. However, only a limited number of investigations are carried out on these systems, and there is a lack of study that investigates post-mainshock performance of this system. The aim of this study is to investigate the influence of mainshock-aftershock (MS-AS) sequence on LCF system and compare the results with conventional moment frames. For this reason, SAC 3-story building, which is designed according to UBC-94, is modeled and analyzed in OpenSEES software package. In the first step, behavior of these structures is investigated using nonlinear dynamic analysis. In the next step, incremental dynamic analysis is employed for different performance levels including IO, LS, and CP states to gain a better insight into the behavior of these structures in MS-AS sequences. Results showed that MS-AS sequences could lead to increase in drift response of the frames with both systems. However, LCF showed a superior performance during seismic sequences.

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References

[1]  H. Ryu, N. Luco, S. Uma, A. Liel, Developing fragilities for mainshock-damaged structures through incremental dynamic analysis, in:  Ninth pacific conference on earthquake engineering, Auckland, New Zealand, 2011.
[2]  Y. Dong, D.M. Frangopol, Risk and resilience assessment of bridges under mainshock and aftershocks incorporating uncertainties, Engineering Structures, 83 (2015) 198-208.
[3]  K. Goda, Nonlinear response potential of mainshock–aftershock sequences from Japanese earthquakes, Bulletin of the Seismological Society of America, 102(5) (2012) 2139-2156.
[4]  R. Song, Y. Li, J.W. van de Lindt, Impact of earthquake ground motion characteristics on collapse risk of post-mainshock buildings considering aftershocks, Engineering Structures, 81 (2014) 349-361.
[5]  G.P. Hayes, P.S. Earle, H.M. Benz, D.J. Wald, R.W. Briggs, 88 Hours: The US Geological Survey national earthquake information center response to the 11 March 2011 Mw 9.0 Tohoku earthquake, Seismological Research Letters, 82(4)(2011) 1-11.
[6]  R. Song, Y. Li, J.W. Van de Lindt, Loss estimation of steel buildings to earthquake mainshock–aftershock sequences, Structural safety, 61 (2016) 1-11.
[7]  F. Omori, On the after-shocks of earthquakes, The University, 1894.
[8]  S.A. Mahin, Effects of duration and aftershocks on inelastic design earthquakes, in:  Proceedings of the 7th world conference on earthquake engineering, 1980, pp. 677-680.
[9]  C. Amadio, M. Fragiacomo, S. Rajgelj, The effects of repeated earthquake ground motions on the non‐linear response of SDOF systems, Earthquake engineering & structural dynamics, 32(2) (2003) 291-308.
[10]  G.D. Hatzigeorgiou, Ductility demand spectra for multiple near-and far-fault earthquakes, Soil Dynamics and Earthquake Engineering, 30(4) (2010) 170-183.
[11]  Y. Li, R. Song, J.W. Van De Lindt, Collapse fragility of steel structures subjected to earthquake mainshockaftershock sequences, Journal of Structural Engineering, 140(12) (2014) 04014095.
[12] M. Malakoutian, J.W. Berman, P. Dusicka, Seismic response evaluation of the linked column frame system, Earthquake engineering & structural dynamics, 42(6) (2013) 795-814.
[13] D.G. Lignos, H. Krawinkler, Deterioration modeling of steel components in support of collapse prediction of steel moment frames under earthquake loading, Journal of Structural Engineering, 137(11) (2011) 1291-1302.
[14] G.G. Amiri, F.M. Dana, Introduction of the most suitable parameter for selection of critical earthquake, Computers & Structures, 83(8-9) (2005) 613-626.
[15] G.G. Amiri, E. Rajabi, Damage evaluation of reinforced concrete and steel frames under critical successive scenarios, International Journal of Steel Structures,17(4)(2017) 1495-1514 .
Amirkabir Journal of Civil Engineering
Volume 52, Issue 2
May 2020
Pages 305-320

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